cmd/go/internal/work: update minimum supported s390x version on go

This updates cgo support for s390x changing from z196 to z13, as
z13 is the minimum machine level running on go for s390x.

Change-Id: I1a102294b2108c35ddb1428bf287ce83debaeac8
Reviewed-on: https://go-review.googlesource.com/c/go/+/666995
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

diff --git a/src/cmd/go/internal/work/exec.go b/src/cmd/go/internal/work/exec.go
index 6fc865421d76a9124cc68616438dcee7d452d676..63fd13f7544db3ed9f3bf3b89956f69d9a5878f5 100644 (file)
--- a/src/cmd/go/internal/work/exec.go
+++ b/src/cmd/go/internal/work/exec.go
@@ -2587,7 +2587,8 @@ func (b *Builder) gccArchArgs() []string {
        case "arm":
                return []string{"-marm"} // not thumb
        case "s390x":
-               return []string{"-m64", "-march=z196"}
+               // minimum supported s390x version on Go is z13
+               return []string{"-m64", "-march=z13"}
        case "mips64", "mips64le":
                args := []string{"-mabi=64"}
                if cfg.GOMIPS64 == "hardfloat" {